/// list-remove
/// Remove an item from a list
/// @param $list - A SASS list
/// @param $index - The list index to remove
/// @returns A SASS list
/// @author Jake Wilson <jake.e.wilson@gmail.com>
@function list-remove($list, $index) {
    $newList: ();
    @for $i from 1 through length($list) {
        @if $i !=$index {
            $newList: append($newList, nth($list, $i), 'space');
        }
    }
    @return $newList;
}